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J a l-.lilrESSINGl Steam Trap.

No. 234,386. Patented. Nov. 16,1880.

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iJNiTn STATES PATENT innen.A

JAMES H. BLESSING, OF ALBANY, NEW YORK, ASSIGNOR TO THE ALBANY STEAMTRAP COMPANY, OF SAME PLACE.

STEAM-TRAP.

SPECIFICATION forming part of Letters Patent No. 234,386, dated November16, 1880.

Application led November 28, 1879.

To all whom it may concern:

Beit known that I, J AMES H. BLEssING. of the city of Albany and Stateof New York, have invented a new and useful Improvement 5 inSteam-Traps, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, in which-Figure l is a vertical cross-section of my o steam-trap. Fig. 2 is anenlarged detail view of the choke-block.

This invention relates to an improvement for freeing the return-pipefrom a steam-trap to a boiler of any air which may accumulate 5 in it,and is shown as applied to the automatic bucket-trap patented to me onthe 27 th day of August, 1878, N o. 207,484, to which reference is madefor a full description.

It is found in practice that the air is very o likely to accumulate,especially when the trap is not Working, in the pipes and connections,both between the boiler and the trap in the coils, and in the connectionbetween the trap and the boiler. To free the trap of this air 5 anautomatic air-valve, A, is attached toits upper portion, and it isevidentthat any air which is forced into the trap from the supplypipe Swill be automatically passed from the trap by means of this air-valve A;but if the o delivery-pipe D should become filled with a-ir it isapparent that such air would prevent the operation of the Siphon whichis formed by this pipe, and consequently the operation of the trap.

5 It is found by experience that the pressure of steam at the end of asystem of coils is appreciably less than the pressure existing in theboiler. I have utilized this fact by attaching a pipe, l), whichcommunicates between the delivery-pipe D and the supply-pipe S,

and is provided with a partial plug or chokeblock, O.

When the bucket is full of water and down, the pressure in the trap isthe boilerpressure.

If, therefore, there were any air existing in 45 the pipe D, it would beforced around through the pipe P into the pipe S, and would thence iiowinto the trap again to escape through the air-valve. This opening isnecessarily made very small, so as not to interfere with the op- 5oeration of the trap, and I prefer to make the choke-block O of steel orsome other hard material. By means of the escape of air from thedelivery-pipe D said pipe becomes gradually filled with water to asufficient height to 5 5 cause the Siphon to operate when the trapresumes its proper function, any air entering it escaping through theair-valve A.

It is found in practice that by means of this connection a trap filledwith air will start itself 6o when steam is made in the boiler withoutthe necessity of blowing off.

What I claim as my invention, and desire to secure by LettersPatent,'is-

1. An automatic steam-trap provided with 65 a tube connecting thewater-supply and delivery pipes, whereby the air from the deliverypipois returned into the trap, substantially as described.

2. An automatic steam-trap provided with 7o an air-valve, and with atube connecting the supply and delivery pipes, whereby the air from thedelivery-pipe is returned into the trap, whence it escapes,substantially as described.

3. An automatic steam-trap provided with an air-valve and with a tubeconnecting the supply and delivery pipes, whereby the air from thedelivery-pipe is returned in to the trap, whence it escapes, said tubebeing pro- 8o vided with a choke-block, or its equivalent, for reducingits aperture, substantially as described.

JAMES H. BLESSING.

Witnesses S. F. SULLIVAN, WM. A. PoLLoeK.

